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Analysis According to EA-Pfähle

The load-settlement curve of a single pile is constructed in the following way:

1) The shaft bearing capacity Rs,k is determined as follows:

  • for bored and CFA piles

  • for driven piles

where:

qs,k,i

-

shaft resistance in i-th layer [kPa]

As,i

-

shaft area in i-th layer [m2]

ssg,ssg*

-

settlement at shaft resistance activation

ηs

-

shaft correction factor

subsequently, the settlement condition is assessed:

  • for bored and CFA piles

  • for driven piles

where:

ssg,ssg*

-

settlement at shaft resistance activation [mm]

Rs,k

-

shaft bearing capacity for settlement ssg resp. ssg* [MN]

If condition does not satisfy, the load curve cannot be constructed.

2) The base bearing capacity Rb,k is calculated in required levels of s/D:

  • for bored and CFA piles

  • for driven piles

where:

qb,k

-

base resistance in level s/D resp. s/Deq [kPa]

Ab

-

base area [m2]

ηb

-

base correction factor

s

-

settlement

D,Deq

-

base diameter

3) The total pile resistance Rc,k is given by:

where:

Rs,k

-

shaft bearing capacity for limit settlement sg [kPa]

Rb,k

-

base bearing capacity for limit settlement sg [kPa]

sg

-

limit settlement 0,1D resp. 0,1Deq

The pile bearing capacity is assessed for compressive loads. The pile loaded by tensile loads is not verified.

The pile verification is carried out according the theory of limit states:

where:

Rc,d

-

design value of total bearing capacity

Rc,k

-

characteristic value of total baring capacity

γt

-

partial factor on total resistance of pile

Vd

-

extreme vertical load acting on a pile

Wp

-

pile self-weight

Literature:

German Geotechnical Society: Recommendations on Piling (EA-Pfähle). Berlin: Ernst & Sohn, 2012.

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